Letter opener



FIG. 1 is a top plan view of a letter opener showing my new design, the bottom plan view thereof being identical with this view;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image of this view;

FIG. 3 is a right side elevational view thereof; and

FIG. 4 is a left side elevational view thereof. 

The ornamental design for a letter opener, as shown and described. 